This challenge involves drawing pictures on a screen or generating image files. For pure ASCII art contests, use [ascii-art] instead. If participants can choose between graphics and ASCII art, use both tags. For images as input, use [image-processing].
0
votes
0answers
35 views
Draw the Serpinski Triangle [duplicate]
For today's fractal challenge, draw at least 5 iterations of Sierpinski's triangle! (Shown below is Sierpinski's trinagle)
The resolution of the image must be sufficent that the smallest triangles ...
5
votes
4answers
439 views
Draw the Hilbert Curve
A hilbert curve is a type of space-filling curve, and it basically maps a line to a plane. Each point in the line corresponds to just one point in the plane, and each point in the plane corresponds to ...
20
votes
4answers
823 views
I really wanted a rhombus, but all I got was this stupid rectangle
Given only a straightedge and compass, inscribe a rhombus inside the given rectangle, sharing two opposite points.
Input
Input is the dimensions of the rectangle. In the example shown, that would be ...
14
votes
2answers
1k views
Golfing Flower of Life
The challenge here is to accurately depict the flower of life (which is a sacred geometrical figure according to some) in the language of your choice.
The design consists an arrangement of circles ...
6
votes
0answers
113 views
Out Steganograph Me! [duplicate]
Out Steganograph Me
As a follow up to this challange, I want to see competitive algorithms for encoding strings as images, and then decoding them.
The Challenge
Your goal is to write a function or ...
15
votes
2answers
316 views
Downgoat-ify Animals!
My Downgoat avatar has several distinct features
These features can however also apply to any other animal.
Specification
Given an image of an animal (technically can be anything), you must apply ...
5
votes
4answers
205 views
Steganographic Squares
Steganographic Squares
Your job is to take in a string, and generate an NxN image that represents this string. You must also write the algorithm that takes in the image and turns it back into a ...
105
votes
45answers
22k views
GO OUT AND VOTE
Today is November 8th, 2016, Election Day in the United States of America.
If you are a U.S. citizen eligible to vote, then go out and vote if you haven't already before answering this challenge. Do ...
20
votes
8answers
686 views
Generate a modulo rosace
The cool stuff
The following rosace can help calculate numbers modulo 7.
In order to do that, you must start at 0 and turn clockwise a number of steps given by the first digit. Then, for each ...
103
votes
24answers
14k views
Appease Your Google Overlords: Draw the “G” Logo
Write a program or function that takes in a positive integer N, and outputs an N×N pixel image of Google's "G" logo according to this* construction:
For example, if N is 400, a 400×...
4
votes
1answer
305 views
Fabulous glamour shot
Found this picture on the web today. Being a lazy programmer, I don't want to actually open google and type a couple of characters. Way too much work! This is such an important task that it should be ...
26
votes
1answer
393 views
Build an aesthetically pleasing divisor tree
An aesthetically pleasing divisor tree is a tree of divisors of input n that, for any composite number m, has two children nodes that are the pair of divisors that are closest to the square root of m. ...
17
votes
6answers
641 views
Simulate a Rubik's cube
A Rubik's cube has 6 colors: red, orange, yellow, white, blue, and green. Red and orange, yellow and white, and blue and green faces are on opposite sides.
Net of a solved Rubik's cube looks like ...
1
vote
1answer
290 views
Write an xkcd feed bot
The new xkcd feed bot room gave me an idea for a simple challenge.
Your code will have to monitor the xkcd website and output all the new comics to the user.
Specs
When first run it should just sit ...
35
votes
9answers
3k views
Quixels - Quantum Pixels
Introduction
A quixel is a quantum pixel. Similar to a classical pixel, it is represented with 3 integer values (Red, Green, Blue). However, quixels are in a super position of these 3 states instead ...
7
votes
5answers
549 views
Draw the Union Jack
Preface
There are many "draw x flag" challenges, and upon searching it turns out there are no challenges to draw the union Jack! I feel like this would be a harder flag to draw but it should still be ...
98
votes
7answers
3k views
Exponentially Slimy Programming: Stacking Minecraft Slimes
Slimes are cube shaped enemies in Minecraft that break into multiple smaller versions of themselves when killed. For the purposes of this challenge we'll depict them as an 8×8 pixel image with 3 ...
5
votes
2answers
472 views
Draw a Fibonacci Network!
What are Fibonacci networks?
In 1202, an Italian mathematician known as Fibonacci posed the following problem:
"A male and a female rabbit are born at the beginning of the year. We assume the ...
12
votes
5answers
375 views
Algebraic curve plotter
An algebraic curve is a certain "1D subset" of the "2D-plane" that can be described as set of zeros {(x,y) in R^2 : f(x,y)=0 }of a polynomial f. Here we consider the 2D-plane as the real plane R^2 ...
2
votes
2answers
338 views
Make a sprite-sheet from all the Stack Exchange sites' favicons
Your goal in this code golf is to compile all the Stack Exchange sites' favicons.
Getting the Domains
The domains you will be using will be:
*.stackexchange.com
stackexchange.com
stackoverflow.com
...
9
votes
6answers
458 views
Reverse Bayer Filter of an image
Almost all digital camera sensors are organized in a grid of photosensors. Each photo sensor is sensitive for one of the primary colors: red, green and blue. The way those photo sensors are organized ...
8
votes
3answers
509 views
Draw the EU Estimated Sign
The specification of the "estimated" sign used by the European Union Directive (U+212e in Unicode, which you may not simply print for this challenge) is quite precise.
To copy some restrictions from ...
76
votes
65answers
17k views
Draw the national flag of Iceland
This year's UEFA Euro 2016 is over and besides a couple of negative headlines there has been a very positive surprise as well – the Iceland national football team. Let's draw their national flag.
...
19
votes
2answers
439 views
Borders of overlapping circles
Given the coordinates of several points on a plane, and the radius of a circle surrounding each point, draw polygons representing the circles and the edges where the circles meet. Straight edges will ...
24
votes
4answers
873 views
Rotate a hypercube
Introduction
A hypercube/tesseract is the 4 dimensional equivalent of a normal cube. It's made by taking a cube net, extending it to the 3rd dimension, then – using the 4th dimension – folding it ...
40
votes
3answers
1k views
Computer Generated Cracked Soil
Write a program that takes in an integer from 0 to 65535 (216-1) and generates a unique 500×500 pixel image that looks as similar as possible to these 6 real life images of cracked soil:
...
26
votes
9answers
1k views
Generate a “GitHub” Avatar
Background / Description
Note: as @HelkaHomba points out, the actual GitHub identicons are not actually random but based on the hash of a username
The default GitHub avatar is a 5x5-pixel image. A ...
10
votes
1answer
299 views
Recursive Steiner Chains
Steiner Chains are a set of N circles where each circle is tangent to 2 other non-intersecting circles as well as the the previous and next circles of the chain, as seen in the below images:
In ...
17
votes
10answers
1k views
Compress your code in an image
This is a quine variation.
Introduction
We all write short code, because some obscure reasons, but whatever we do, the'll take up at least 144 pixels/byte (with a 12px font). But what would happen, ...
27
votes
1answer
523 views
Gasket Weaving - draw a Sierpiński knot
Given an integer N >= 2, produce an image showing a Sierpiński knot of degree N.
For example, here are knots of degree 2, 3, 4 and 5:
Click on the images to view full size (the higher the degree the ...
7
votes
2answers
363 views
Outline a PNG image
Intro (semi fictional)
I'm the solo developer of a game, I'm already struggling with character design as is. Hence I've thought of a smart solution, I'll just use images for regular monsters, outline ...
5
votes
1answer
244 views
Tiling by substitution
EDIT: The incorrect A rhomb substitution has been fixed. Apologies to anoyone who had started working on a solution.
Consider the following substitutions, where the substituted rhomb(us) is scaled up ...
29
votes
9answers
1k views
Between the Lines
While doodling around on square-ruled paper the other day, I came up with the above negative-space font for digits. In case you haven't spotted it yet, the spaces between the above shapes yield the ...
23
votes
3answers
1k views
Rainbowlify An Image
This challenge is about gradually shifting hues in an image to make pretty pictures like this:
(original)
Challenge
Write a program or function that takes in two non-negative integers and an image ...
10
votes
3answers
722 views
Draw a simple cube
We don't have a single challenge about drawing a real 3 dimensional cube, so here it goes:
Challenge
Your task is to draw a rotated, cube with perspective. It can be in a separate window or as an ...
4
votes
4answers
588 views
Box-256 Assembly - BIG SQUARE II
I'd like to start a series of challenges for http://box-256.com/ starting with the first challenge, “BIG SQUARE II”. After this one I'll add another for "CHECKERBOARD" and so on.
Rules:
Complete the ...
13
votes
3answers
976 views
Create a pie chart
The challenge is simple:
Create a pie-chart based on a number of input values.
The input will be a list of positive numbers, decimal or integers, and the output will be a pie-chart where each of the ...
11
votes
3answers
516 views
Draw a spiral in a box
This geometric spiral looks complicated, but it's fairly simple to draw; take the following box:
Draw a straight line between the corner of the box and some set distance above the next corner counter-...
22
votes
3answers
797 views
Draw a random hexa-glyph
The above image is called a hexa-glyph. Hexa-glyphs are some cool patterns I made up while doodling during my DiffEq class. Here's how you make one:
Consider the following set of points, shaped ...
13
votes
16answers
3k views
Invert png image
Create program or function that takes file name as an argument or reads it from standard input, and completes the following task:
Read image from a png file (name given as argument).
Reverse colors ...
-6
votes
4answers
211 views
Graph an equation!
Please note that this question is different from this question. This one asks for graphical output, while the other one asks for ascii art.
Objective
Help! Timmy's graphing calculator broke! His ...
22
votes
29answers
3k views
Draw the rainbow
The challenge is simple: Draw a rainbow in as few bytes as possible
The specs for the rainbow are as follows:
The figure must be exactly 400 pixels wide and 200 pixels high (optionally 401x201 if ...
3
votes
1answer
302 views
What time is it again? [closed]
The Inspiration
The Challenge
I'm tired of seeing the same old-same old clock in my top-right-hand corner of my screen. It's time for a new clock. While the clock clock sated my lack of interesting ...
12
votes
3answers
581 views
Fill the holes in letters
Sometimes when I'm bored, I take some text and fill the "holes" in the letters. But isn't filling the holes the most boring thing you can do? I think we should automate it, so we could use our time ...
29
votes
3answers
3k views
Dank Meme Generator
I like making dank memes out of my own images. But all those so called "quick meme" sites just have too much code. I realized that the only way to make the dankest meme generator is to ask you guys at ...
20
votes
30answers
3k views
Build a chessboard
Saw this in a PHP challenge. The objective is to make a chessboard with 64 squares (8*8) with the minimum amount of code.
Simple enough, I made mine in PHP in 356 bytes (not impressive, I know) and I ...
83
votes
9answers
3k views
Patch the Image
In a popular image editing software there is a feature, that patches (The term used in image processing is inpainting as @mınxomaτ pointed out.) a selected area of an image, based on the information ...
190
votes
34answers
28k views
Paint Starry Night, objectively, in 1kB of code
Below is a 386x320 png representation of van Gogh's Starry Night.
Your goal is to reproduce this image as closely as possible, in no more than 1024 bytes of code. For the purposes of this challenge, ...
22
votes
6answers
1k views
Triangular Ulam spiral
We've had a couple of challenges about the Ulam spiral. But that's not enough.
In this challenge we will plot a triangular Ulam spiral (as opposed to the usual, square Ulam spiral). Here's a sketch ...
23
votes
6answers
2k views
Flip It, Flop It, Mean It
Overview
Given an image in plain PPM (P3) format as input, for each pixel p in the image, replace each of the following 4 pixels' red, green, and blue with the floored average value of the respective ...
